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<h1 class="title">dynamiclist.qml 示例文件</h1>
<span class="subtitle">views/listview/dynamiclist.qml</span>
<!-- $$$views/listview/dynamiclist.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
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  **
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  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>
  import QtQuick 2.0
  import &quot;content&quot;

  <span class="comment">// This example shows how items can be dynamically added to and removed from</span>
  <span class="comment">// a ListModel, and how these list modifications can be animated.</span>

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">id</span>: <span class="name">container</span>
      <span class="name">width</span>: <span class="number">500</span>; <span class="name">height</span>: <span class="number">400</span>
      <span class="name">color</span>: <span class="string">&quot;#343434&quot;</span>

      <span class="comment">// The model:</span>
      <span class="type"><a href="../qtqml/qml-qtqml-models-listmodel.html">ListModel</a></span> {
          <span class="name">id</span>: <span class="name">fruitModel</span>

          <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> {
              <span class="name">name</span>: <span class="string">&quot;Apple&quot;</span>; <span class="name">cost</span>: <span class="number">2.45</span>
              <span class="name">attributes</span>: [
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Core&quot;</span> },
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Deciduous&quot;</span> }
              ]
          }
          <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> {
              <span class="name">name</span>: <span class="string">&quot;Banana&quot;</span>; <span class="name">cost</span>: <span class="number">1.95</span>
              <span class="name">attributes</span>: [
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Tropical&quot;</span> },
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Seedless&quot;</span> }
              ]
          }
          <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> {
              <span class="name">name</span>: <span class="string">&quot;Cumquat&quot;</span>; <span class="name">cost</span>: <span class="number">3.25</span>
              <span class="name">attributes</span>: [
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Citrus&quot;</span> }
              ]
          }
          <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> {
              <span class="name">name</span>: <span class="string">&quot;Durian&quot;</span>; <span class="name">cost</span>: <span class="number">9.95</span>
              <span class="name">attributes</span>: [
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Tropical&quot;</span> },
                  <span class="type"><a href="../qtqml/qml-qtqml-models-listelement.html">ListElement</a></span> { <span class="name">description</span>: <span class="string">&quot;Smelly&quot;</span> }
              ]
          }
      }

      <span class="comment">// The delegate for each fruit in the model:</span>
      <span class="type"><a href="../qtqml/qml-qtqml-component.html">Component</a></span> {
          <span class="name">id</span>: <span class="name">listDelegate</span>
          <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
              <span class="name">id</span>: <span class="name">delegateItem</span>
              <span class="name">width</span>: <span class="name">listView</span>.<span class="name">width</span>; <span class="name">height</span>: <span class="number">80</span>
              <span class="name">clip</span>: <span class="number">true</span>

              <span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
                  <span class="name">id</span>: <span class="name">arrows</span>
                  <span class="type">anchors</span> {
                      <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>
                      <span class="name">verticalCenter</span>: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                  }
                  <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
                      <span class="name">source</span>: <span class="string">&quot;content/pics/arrow-up.png&quot;</span>
                      <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">move</span>(<span class="name">index</span>, <span class="name">index</span><span class="operator">-</span><span class="number">1</span>, <span class="number">1</span>) }
                  }
                  <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">source</span>: <span class="string">&quot;content/pics/arrow-down.png&quot;</span>
                      <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">move</span>(<span class="name">index</span>, <span class="name">index</span><span class="operator">+</span><span class="number">1</span>, <span class="number">1</span>) }
                  }
              }

              <span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
                  <span class="type">anchors</span> {
                      <span class="name">left</span>: <span class="name">arrows</span>.<span class="name">right</span>
                      <span class="name">horizontalCenter</span>: <span class="name">parent</span>.<span class="name">horizontalCenter</span>;
                      <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                  }

                  <span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
                      <span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span>
                      <span class="name">text</span>: <span class="name">name</span>
                      <span class="name">font</span>.pixelSize: <span class="number">15</span>
                      <span class="name">color</span>: <span class="string">&quot;white&quot;</span>
                  }
                  <span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
                      <span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span>
                      <span class="name">spacing</span>: <span class="number">5</span>
                      <span class="type"><a href="qml-qtquick-repeater.html">Repeater</a></span> {
                          <span class="name">model</span>: <span class="name">attributes</span>
                          <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="name">description</span>; <span class="name">color</span>: <span class="string">&quot;White&quot;</span> }
                      }
                  }
              }

              <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
                  <span class="type">anchors</span> {
                      <span class="name">left</span>: <span class="name">arrows</span>.<span class="name">right</span>
                      <span class="name">horizontalCenter</span>: <span class="name">parent</span>.<span class="name">horizontalCenter</span>;
                      <span class="name">top</span>: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                      <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">bottom</span>
                  }

                  <span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
                      <span class="name">anchors</span>.centerIn: <span class="name">parent</span>
                      <span class="name">spacing</span>: <span class="number">10</span>

                      <span class="type">PressAndHoldButton</span> {
                          <span class="name">anchors</span>.verticalCenter: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                          <span class="name">source</span>: <span class="string">&quot;content/pics/plus-sign.png&quot;</span>
                          <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">setProperty</span>(<span class="name">index</span>, <span class="string">&quot;cost&quot;</span>, <span class="name">cost</span> <span class="operator">+</span> <span class="number">0.25</span>)
                      }

                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
                          <span class="name">id</span>: <span class="name">costText</span>
                          <span class="name">anchors</span>.verticalCenter: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                          <span class="name">text</span>: <span class="string">'$'</span> <span class="operator">+</span> <span class="name">Number</span>(<span class="name">cost</span>).<span class="name">toFixed</span>(<span class="number">2</span>)
                          <span class="name">font</span>.pixelSize: <span class="number">15</span>
                          <span class="name">color</span>: <span class="string">&quot;white&quot;</span>
                          <span class="name">font</span>.bold: <span class="number">true</span>
                      }

                      <span class="type">PressAndHoldButton</span> {
                          <span class="name">anchors</span>.verticalCenter: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                          <span class="name">source</span>: <span class="string">&quot;content/pics/minus-sign.png&quot;</span>
                          <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">setProperty</span>(<span class="name">index</span>, <span class="string">&quot;cost&quot;</span>, <span class="name">Math</span>.<span class="name">max</span>(<span class="number">0</span>,<span class="name">cost</span><span class="operator">-</span><span class="number">0.25</span>))
                      }

                      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
                          <span class="name">source</span>: <span class="string">&quot;content/pics/list-delete.png&quot;</span>
                          <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill:<span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">remove</span>(<span class="name">index</span>) }
                      }
                  }
              }

              <span class="comment">// Animate adding and removing of items:</span>
              <span class="name">ListView</span>.onAdd: <span class="name">SequentialAnimation</span> {
                  <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">delegateItem</span>; <span class="name">property</span>: <span class="string">&quot;height&quot;</span>; <span class="name">value</span>: <span class="number">0</span> }
                  <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">target</span>: <span class="name">delegateItem</span>; <span class="name">property</span>: <span class="string">&quot;height&quot;</span>; <span class="name">to</span>: <span class="number">80</span>; <span class="name">duration</span>: <span class="number">250</span>; <span class="name">easing</span>.type: <span class="name">Easing</span>.<span class="name">InOutQuad</span> }
              }

              <span class="name">ListView</span>.onRemove: <span class="name">SequentialAnimation</span> {
                  <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">delegateItem</span>; <span class="name">property</span>: <span class="string">&quot;ListView.delayRemove&quot;</span>; <span class="name">value</span>: <span class="number">true</span> }
                  <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">target</span>: <span class="name">delegateItem</span>; <span class="name">property</span>: <span class="string">&quot;height&quot;</span>; <span class="name">to</span>: <span class="number">0</span>; <span class="name">duration</span>: <span class="number">250</span>; <span class="name">easing</span>.type: <span class="name">Easing</span>.<span class="name">InOutQuad</span> }

                  <span class="comment">// Make sure delayRemove is set back to false so that the item can be destroyed</span>
                  <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">delegateItem</span>; <span class="name">property</span>: <span class="string">&quot;ListView.delayRemove&quot;</span>; <span class="name">value</span>: <span class="number">false</span> }
              }
          }
      }

      <span class="comment">// The view:</span>
      <span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> {
          <span class="name">id</span>: <span class="name">listView</span>
          <span class="type">anchors</span> {
              <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">top</span>: <span class="name">parent</span>.<span class="name">top</span>;
              <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span>; <span class="name">bottom</span>: <span class="name">buttons</span>.<span class="name">top</span>;
              <span class="name">margins</span>: <span class="number">20</span>
          }
          <span class="name">model</span>: <span class="name">fruitModel</span>
          <span class="name">delegate</span>: <span class="name">listDelegate</span>
      }

      <span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
          <span class="name">id</span>: <span class="name">buttons</span>
          <span class="type">anchors</span> { <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">bottom</span>; <span class="name">margins</span>: <span class="number">20</span> }
          <span class="name">spacing</span>: <span class="number">10</span>

          <span class="type">TextButton</span> {
              <span class="name">text</span>: <span class="string">&quot;Add an item&quot;</span>
              <span class="name">onClicked</span>: {
                  <span class="name">fruitModel</span>.<span class="name">append</span>({
                      &quot;name&quot;: <span class="string">&quot;Pizza Margarita&quot;</span>,
                      &quot;cost&quot;: <span class="number">5.95</span>,
                      &quot;attributes&quot;: [{&quot;description&quot;: <span class="string">&quot;Cheese&quot;</span>}, {&quot;description&quot;: <span class="string">&quot;Tomato&quot;</span>}]
                  })
              }
          }

          <span class="type">TextButton</span> {
              <span class="name">text</span>: <span class="string">&quot;Remove all items&quot;</span>
              <span class="name">onClicked</span>: <span class="name">fruitModel</span>.<span class="name">clear</span>()
          }
      }
  }

</pre>
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<!-- @@@views/listview/dynamiclist.qml -->
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